#8: Rollerblade

The generic term is "in-line skates," but many people refer to them by the trademark Rollerblades.

In-line skates are actually the oldest kind of roller skates, dating back to the late 1700s.

In the late 1800s a version of roller skates with two parallel sets of wheels (sometimes called "quads") allowed skaters to turn and maneuver easily, and launched a roller skating craze in the U.S. and Western Europe.